Chapter 3.2 and 3.3 day and night + the seasons

• Day and night
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Astronomy

3.2 Day and night

+

3.3 The seasons

Goals

• Describe what axis, rotation and revolution mean.
  
• Explain why we have day and night and why the sun rises in the east en sets in the west.
  
• Explain why the sun appears to move across the sky
• Describe how Foucault's pendulum shows the earth rotation

• Explain how Foucaults pendulum work.
• Explain how the earth' s tilt causes the seasons.
• Explain how the earth's tilt affect the path of the sun over the sky

Difference between rotation and revolution

Axis: the imaginary line that extends from the North Pole to the South Pole.

Day and night

Foucaults pendulum

A demonstration

The Sun rises in the east

The Sun sets in the west

Why the sun rises in the east and sets in the west?

The Sun, the Moon, the planets, and the stars all rise in the east and set in the west. And that's because Earth spins -- toward the east.

www.earthspacelab.com

What causes the seasons

Earth's tilted axis causes the seasons. Throughout the year, different parts of Earth receive the Sun's most direct rays. So, when the North Pole tilts toward the Sun, it's summer in the Northern Hemisphere. And when the South Pole tilts toward the Sun, it's winter in the Northern Hemisphere.

Conclusion

What have we learned?

Goals

• Describe what axis, rotation and revolution mean.
  
• Explain why we have day and night and why the sun rises in the east en sets in the west.
  
• Explain why the sun appears to move across the sky
• Describe how Foucault's pendulum shows the earth rotation

• Explain how Foucaults pendulum work.
• Explain how the earth' s tilt causes the seasons.
• Explain how the earth's tilt affect the path of the sun over the sky